The content of magnesium chloride is more than 46%, and six water and magnesium chloride is also known as hydrochlorite chemical formula MgCl2·6H2O, sub-volume: 203.3. Colorless crystals, flaky or granular, bitter. Easy to dissolve in water and ethanol, when the humidity is large, easy deliquescence. 116 ~ 118 ℃ hot melt down. Magnesia cement is mixed with magnesium oxide and water. React with the hydroxide of alkali or alkaline earth metals. Used for making refractories, magnesium salt, light fireproof building materials, refractory materials, snow melt agents, antifreeze, papermaking and so on.